Hi Apapappa, sorry I didn't noticed before that there are these buttons for diagonal aiming. I tried again the demo and notice that they don't work by default, only after I went in the controller configuration options.
But, I said before I didn't find any bugs, well I think this might be a bug though. I'm using an Xbox Series X controller (later also tried an Xbox One and a PS4 controller). On both Xbox controllers the shoulder and trigger buttons started working only after I went in the controller configuration menu, even if I didn't change anything. But the left trigger for straight down aim never worked, even when remaping or reseting the controller configuration. Also on the PS4 controller I noticed that several buttons do not mach, for example, cross button is actually circle button, and most buttons had this issue on the PS4 controller. I tried this with only one cotroller plugged in at a time and relaunching the demo each time after swapping controllers. I may try the demo again later on a different PC to see how it goes, in case it has something to do with the PC I'm using. Hope this helps, and have a good day!